One way is go to the local gaming store and ask the staff. Failing that, http://www.accessdenied.net/ is another way. Depending on the game check the game's forum to see if there is a game in your area. I hope that helps.

DnD MeetUp. MeetUp is an online service for just about every hobby you can think of, and DnD is definitely in there. Also, worst case scenario and there's no one in your area, you can start a MeetUp group and bring in other people.

You could also announce what area you're moving to here and see if anyone is close and has an opening.

Well, since I've not been adept at finding decent gamers from online (no offense to anyone here), I usually just find one around work. This gives you a firsthand appraisal of their personality type. You get a feel of the person before you invite them. Just make sure the co-workers you consider inviting have progressed beyond high school mentality.